Operations By Segment And Geographic Areas And Identifiable Assets (Selected Information In Relation To Continuing Operations) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Intersegment net sales	$ (0.8)	$ (0.9)	$ (1.1)
Total net sales	1,708.9	1,416.8	1,224.5
Earnings from operations	163.6	155.5	113.5
Total Assets	3,922.1	3,536.7	3,673.9
Aerospace Materials [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	877.1	722.6	606.4
Intersegment net sales	0	0	0
Total net sales	877.1	722.6	606.4
Earnings from operations	155.6	113.8	97.0
Percentage of sales	17.70%	15.70%	16.00%
Total Assets	1,016.6	872.5	750.9
Capital expenditures	68.5	34.5	52.1
Depreciation and amortization	26.3	20.0	15.2
Industrial Materials [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	176.4	66.6	53.8
Intersegment net sales	0	0	0
Total net sales	176.4	66.6	53.8
Earnings from operations	10.7	11.1	10.1
Percentage of sales	6.00%	16.70%	18.80%
Total Assets	520.5	46.0	39.7
Capital expenditures	5.1	1.5	2.3
Depreciation and amortization	8.4	0.9	0.6
In-Process Separation [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	384.2	339.5	292.2
Intersegment net sales	0	0	0
Total net sales	384.2	339.5	292.2
Earnings from operations	91.8	69.7	55.2
Percentage of sales	23.90%	20.50%	18.90%
Total Assets	369.5	311.1	308.0
Capital expenditures	60.4	17.6	9.7
Depreciation and amortization	16.9	14.4	13.2
Additive Technologies [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	270.4	287.2	271.0
Intersegment net sales	0.8	0.9	1.1
Total net sales	271.2	288.1	272.1
Earnings from operations	37.9	39.4	40.3
Percentage of sales	14.00%	13.70%	14.80%
Total Assets	207.4	202.6	209.7
Capital expenditures	11.1	16.1	9.3
Depreciation and amortization	13.6	11.2	9.3
Total Segments [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	1,708.1	1,415.9	1,223.4
Intersegment net sales	0.8	0.9	1.1
Total net sales	1,708.9	1,416.8	1,224.5
Earnings from operations	296.0	234.0	202.6
Percentage of sales	17.30%	16.50%	16.50%
Total Assets	2,114.0	1,432.2	1,308.3
Capital expenditures	145.1	69.7	73.4
Depreciation and amortization	$ 65.2	$ 46.5	$ 38.3

Earnings from operation of a segment as a percentage of its sales.

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- Definition

Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 28

-Subparagraph b

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Concepts (CON)

-Number 6

-Paragraph 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Amount of revenue from external customers for the reportable segment. Such disclosure is presented if the amount is: (a) included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph a

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Amount of revenue from transactions with other operating segments of the same entity.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

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Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 280

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